Influence of resting periods on polyethylene wear in a knee simulator study

Knee wear simulator studies are performed to evaluate the wear behavior of implants. These wear studies simulate in vivo situations as closely as possible. Simulation of the human gait cycle is often carried out continuously according to international standards. However, implants are not loaded cont...

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Published inMedical science monitor Vol. 15; no. 11; pp. MT143 - MT146
Main Authors Kretzer, J Philippe, Jakubowitz, Eike, Hofmann, Kerstin, Heisel, Christian, Lietz, Eva
Format Journal Article
LanguageEnglish
Published United States 01.11.2009
Subjects
Computer Simulation
Gait
Humans
Knee Prosthesis
Polyethylene - chemistry
Rest - physiology
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Summary:Knee wear simulator studies are performed to evaluate the wear behavior of implants. These wear studies simulate in vivo situations as closely as possible. Simulation of the human gait cycle is often carried out continuously according to international standards. However, implants are not loaded continuously in vivo, so it might be advisable to implement resting periods in which no motion occurs. In the present study the influence of resting periods on the wear behavior of a commercial implant was analyzed using a force-controlled AMTI knee simulator. The wear rates were 2.27+/-0.23 mg/10(6) cycles for a simulation with resting periods and 2.85+/-0.27 mg/10(6) cycles for a reference simulation without resting periods. There was no significant difference (p=0.22) in wear behavior between these two tests. The present study shows that continuous simulation without the implementation of resting periods is a valid approach for assessing the wear of knee implants.
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ISSN:1643-3750